CN105983657A - Method for forming chrome bronze casting through investment casting under vacuum environment - Google Patents
Method for forming chrome bronze casting through investment casting under vacuum environment Download PDFInfo
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- CN105983657A CN105983657A CN201510057494.1A CN201510057494A CN105983657A CN 105983657 A CN105983657 A CN 105983657A CN 201510057494 A CN201510057494 A CN 201510057494A CN 105983657 A CN105983657 A CN 105983657A
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Abstract
The embodiment of the invention discloses a method for forming a chrome bronze casting through investment casting under a vacuum environment. Under the condition of the vacuum environment, electrolytic copper and a copper-chrome intermediate alloy are prepared according to a certain ratio and then arranged in a graphite crucible; heating is conducted in a graphite resistor heating manner; after the copper and chrome are fully molten, molten chrome bronze is poured into a fired mold through an intra-furnace mechanical pouring system; and the casting is obtained by removing a mold shell after cooling. The defects that at current, during chrome bronze casting, the casting quality is poor, the mechanical property is poor, conductivity is poor and the casting loss is serious can be obviously improved or overcome. The problems that chromium is extremely likely to be oxidized in the atmosphere, the molten chrome bronze is poor in fluidity, large in viscosity and is likely to bond with the crucible or the mold, and the chrome loss is large are effectively solved. The quality of the chrome bronze casting is greatly improved. According to the method, the defects that the size of a vacuum furnace is small and the number of arranged pieces is small are effectively overcome through the investment casting manner. The pouring problem is effectively solved in a closed container in a mechanical transmission manner.
Description
Technical field
The present invention relates to bronze casting field, particularly relate to model casting chromium-bronze method for casting under a kind of vacuum environment.
Background technology
At present, chromium-bronze foundry goods is typically casting under atmospheric environment, and its product exists following several respects shortcoming:
1. casting flaw is serious, and yield rate is low.Due to chromium-bronze liquation poor fluidity under atmospheric environment, cause foundry goods that the defect that many such as pore, shrinkage cavity, loose, slag inclusion etc. are difficult to avoid that occurs.
2. casting loss is serious, and casting cost is high.Under atmospheric environment due to chromium-bronze liquation poor fluidity, viscosity greatly, easily bond crucible, mould, causes the loss of copper liquid serious, and waste is up to 20% to 30%.
3. chromium content is on the low side, bad mechanical property.Easily aoxidizing due to chromium element under atmospheric environment, in casting process, chromium loss is serious, causes chromium content on the low side, and after fixation rates, hardness and tensile strength are not enough.
4. conductive effect is poor.Owing to foundry goods air content is high, oxide slag inclusion is serious under atmospheric environment, foundry goods electric conductivity is caused to decline.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, the problems such as chromium element the most easily aoxidize, chromium-bronze liquation poor fluidity, viscosity are big, easily bond and chromium waste is big that provide one effectively to solve, greatly improve the quality of chromium-bronze foundry goods, effectively solve the few defect of the little piece installing of vacuum drying oven volume, effectively solve model casting chromium-bronze method for casting under the vacuum environment of cast problem.
Under described vacuum environment, model casting chromium-bronze method for casting, comprises the steps:
(1) fusible pattern is made: according to production wax-pattern, wax pattern processed, welding combination wax pattern, coat formwork, dewaxing, roasting mold shell；
(2): make copper chromium intermediate alloy；Crucible is put into, melting more than four hours under vacuum conditions after cathode copper and crome metal being prepared；
(3): make graphite crucible, according to vacuum drying oven amount of capacity, use respective diameters and the graphite rod of length, the shaped and graphite crucible of size, after crucible is made, add a bellmouth in crucible bottom；
(4): protection crucible.By crucible internal walls brushing graphite water Ji or stickup graphite paper, then put it into drying in oven；
(5): make pourer stopper, cup, be processed into pourer stopper, cup with the graphite rod of certain diameter；Process a cone matched with crucible bottom taper hole at pourer stopper, sealing and unlatching effect when supporting the use with crucible, can be played；
(6): prepare copper and copper chromium intermediate alloy material, according to the weight of foundry goods, prepare copper and copper chromium intermediate alloy material and prepare；
(7): dress crucible, being first assembled in crucible bottom taper hole by pourer stopper, then crucible is put into vacuum drying oven heater, then the copper prepared and copper chromium intermediate alloy material are encased in crucible, copper chromium intermediate alloy should be placed on the bottom of crucible；
(8): dress fusible pattern, roasting formwork is put into vacuum drying oven, is placed on mechanical lifting gear, then cup is placed on fusible pattern cast gate, the pourer stopper of cup alignment crucible bottom；
(9): evacuation, vacuum pump is started, within vacuum in stove is evacuated to 30Pa；
(10): add hot smelting, power transmission heats, and controls smelting temperature by temperature control system, and smelting temperature should control at 1300 DEG C-1400 DEG C, and smelting time should be more than 2 hours；
(11): cast, after melting completes, by machine driven system by fusible pattern jack-up, opening pourer stopper, copper liquid is poured in fusible pattern；
(12): come out of the stove, after closing heating, must cool down again more than 1 hour and close vacuum pump, then open fire door and take out formwork；
(13): remove fusible pattern, by mechanical vibration mode, fusible pattern is disposed, obtain foundry goods.
By cathode copper and crome metal by putting into crucible after the proportions of 50:3 in described step 2, melting more than four hours under vacuum conditions.
Weight according to foundry goods in described step 6, prepares copper and copper chromium intermediate alloy material also presses 3:1 proportions.
Implement the embodiment of the present invention, have the advantages that
Under embodiment of the present invention vacuum environment, model casting chromium-bronze method for casting is under the conditions of vacuum environment, load after cathode copper and copper chromium intermediate alloy are prepared by a certain percentage in graphite crucible, use the heating of graphite resistance mode of heating, (smelting temperature 1300 DEG C-1500 DEG C after copper and chromium fully melt, more than time 2 h), by machinery running gate system in stove, chromium-bronze liquation is poured in fusible pattern, after cooling formwork is disposed and obtain foundry goods, can be obviously improved or solve current chromium-bronze casting present in casting quality poor, bad mechanical property, electric conductivity is poor, the defects such as casting loss is serious；Effectively solve that chromium element the most easily aoxidizes, chromium-bronze liquation poor fluidity, viscosity are big, easily bonding and the problem such as chromium waste is big, greatly improve the quality of chromium-bronze foundry goods；The present invention uses model casting mode, effectively solves the defect that the little piece installing of vacuum drying oven volume is few；The present invention uses mechanical drive mode effectively to solve cast problem in hermetic container.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below the present invention is described in further detail.
Under embodiment of the present invention vacuum environment, model casting chromium-bronze method for casting, comprises the steps:
The precondition of embodiment of the present invention: 1. vertical vacuum furnace；2. vacuum pump；3. temperature control system (thermocouple, intelligent digital readout temperature controller)；4. machinery running gate system (bevel gear, leading screw, cup, pourer stopper)；5. graphite heating system (graphite heater, graphite pallet, graphite muff)；6. graphite crucible；7. fusible pattern；8. copper and copper chromium intermediate alloy.
Embodiment:
The first step: make fusible pattern.Formwork dewaxing roasting mold shell is coated according to production wax-pattern wax pattern welding combination wax pattern.
Second step: make copper chromium intermediate alloy.By cathode copper and crome metal by putting into crucible after the proportions of 50:3, melting more than four hours under vacuum conditions.
3rd step: make graphite crucible.According to vacuum drying oven amount of capacity, use respective diameters and the graphite rod of length, the shaped and graphite crucible of size.After crucible is made, add a bellmouth in crucible bottom.
4th step: protection crucible.By crucible internal walls brushing graphite water Ji or stickup graphite paper, then put it into drying in oven (temperature sets 200 degree, is incubated and is advisable for 2 hours).
5th step: make pourer stopper, cup.It is processed into pourer stopper, cup with the graphite rod of certain diameter.Pourer stopper adds one cone matched with crucible bottom taper hole of requirement processing in man-hour, can play sealing and unlatching effect with crucible when supporting the use.Cup adds to require man-hour to play protects copper liquid not leak outside, and can play again the effect of jack-up pourer stopper.
6th step: prepare copper and copper chromium intermediate alloy material.According to the weight of foundry goods, prepare copper and copper chromium intermediate alloy material and press 3:1 proportions.
7th step: dress crucible.First being assembled in crucible bottom taper hole by pourer stopper, then crucible is put into vacuum drying oven heater, then the copper prepared and copper chromium intermediate alloy material are encased in crucible, copper chromium intermediate alloy should be placed on the bottom of crucible.
8th step: dress fusible pattern.Roasting formwork is put into vacuum drying oven, is placed on mechanical lifting gear, then cup is placed on fusible pattern cast gate, the pourer stopper of cup alignment crucible bottom.
9th step: evacuation.Start vacuum pump, within vacuum in stove is evacuated to 30Pa；
Tenth step: add hot smelting.Power transmission heats, and controls smelting temperature by temperature control system, and smelting temperature should control at 1300 DEG C-1400 DEG C, and smelting time should be more than 2 hours.
11st step: cast.After melting completes, by machine driven system by fusible pattern jack-up, opening pourer stopper, copper liquid is poured in fusible pattern.
12nd step: come out of the stove.After closing heating, must cool down again more than 1 hour and close vacuum pump, then open fire door and take out formwork.
13rd step: remove fusible pattern.By mechanical vibration mode, fusible pattern is disposed, obtain foundry goods.
Under embodiment of the present invention vacuum environment, model casting chromium-bronze method for casting is under the conditions of vacuum environment, load after cathode copper and copper chromium intermediate alloy are prepared by a certain percentage in graphite crucible, use the heating of graphite resistance mode of heating, (smelting temperature 1300 DEG C-1500 DEG C after copper and chromium fully melt, more than time 2 h), by machinery running gate system in stove, chromium-bronze liquation is poured in fusible pattern, after cooling formwork is disposed and obtain foundry goods, can be obviously improved or solve current chromium-bronze casting present in casting quality poor, bad mechanical property, electric conductivity is poor, the defects such as casting loss is serious；Effectively solve that chromium element the most easily aoxidizes, chromium-bronze liquation poor fluidity, viscosity are big, easily bonding and the problem such as chromium waste is big, greatly improve the quality of chromium-bronze foundry goods；The present invention uses model casting mode, effectively solves the defect that the little piece installing of vacuum drying oven volume is few；The present invention uses mechanical drive mode effectively to solve cast problem in hermetic container.
Above disclosed it is only one preferred embodiment of the present invention, certainly can not limit the interest field of the present invention, the equivalent variations therefore made according to the claims in the present invention with this, still belong to the scope that the present invention is contained.
Claims (3)
1. model casting chromium-bronze method for casting under a vacuum environment, it is characterised in that comprise the steps:
(1): make fusible pattern: according to production wax-pattern, wax pattern processed, welding combination wax pattern, coat formwork, dewaxing, roasting mold shell；
(2): make copper chromium intermediate alloy；Crucible is put into, melting more than four hours under vacuum conditions after cathode copper and crome metal being prepared；
(3): make graphite crucible, according to vacuum drying oven amount of capacity, use respective diameters and the graphite rod of length, the shaped and graphite crucible of size, after crucible is made, add a bellmouth in crucible bottom；
(4): protection crucible, by crucible internal walls brushing graphite water Ji or stickup graphite paper, drying in oven is then put it into；
(5): make pourer stopper, cup, be processed into pourer stopper, cup with the graphite rod of certain diameter；Process a cone matched with crucible bottom taper hole at pourer stopper, sealing and unlatching effect when supporting the use with crucible, can be played；
(6): prepare copper and copper chromium intermediate alloy material, according to the weight of foundry goods, prepare copper and copper chromium intermediate alloy material and prepare；
(7): dress crucible, being first assembled in crucible bottom taper hole by pourer stopper, then crucible is put into vacuum drying oven heater, then the copper prepared and copper chromium intermediate alloy material are encased in crucible, copper chromium intermediate alloy should be placed on the bottom of crucible；
(8): dress fusible pattern, roasting formwork is put into vacuum drying oven, is placed on mechanical lifting gear, then cup is placed on fusible pattern cast gate, the pourer stopper of cup alignment crucible bottom；
(9): evacuation, vacuum pump is started, within vacuum in stove is evacuated to 30Pa；
(10): add hot smelting, power transmission heats, and controls smelting temperature by temperature control system, and smelting temperature should control at 1300 DEG C-1400 DEG C
, smelting time should be more than 2 hours；
(11): cast, after melting completes, by machine driven system by fusible pattern jack-up, opening pourer stopper, copper liquid is poured in fusible pattern；
(12): come out of the stove, after closing heating, must cool down again more than 1 hour and close vacuum pump, then open fire door and take out formwork；
(13): remove fusible pattern, by mechanical vibration mode, fusible pattern is disposed, obtain foundry goods.
2. model casting chromium-bronze method for casting under the vacuum environment as described in claim 1, it is characterised in that: by cathode copper and crome metal by putting into crucible after the proportions of 50:3 in described step 2, melting more than four hours under vacuum conditions.
3. model casting chromium-bronze method for casting under the vacuum environment as described in claim 1, it is characterised in that: weight according to foundry goods in described step 6, prepare copper and copper chromium intermediate alloy material also presses 3:1 proportions.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110346434.7A CN113084089A (en) | 2015-02-04 | 2015-02-04 | Method for investment casting of chromium bronze casting under vacuum environment |
| CN201510057494.1A CN105983657A (en) | 2015-02-04 | 2015-02-04 | Method for forming chrome bronze casting through investment casting under vacuum environment |
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| CN201510057494.1A CN105983657A (en) | 2015-02-04 | 2015-02-04 | Method for forming chrome bronze casting through investment casting under vacuum environment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109365749A (en) * | 2018-12-06 | 2019-02-22 | 宁国市华成金研科技有限公司 | Precision-investment manufactures vacuum-thermoform production technology |
| CN110947909A (en) * | 2019-12-20 | 2020-04-03 | 苏州创实精密五金有限公司 | Manufacturing method of chromium bronze joint casting for generator |
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| CN101377383A (en) * | 2008-09-23 | 2009-03-04 | 无锡范尼韦尔工程有限公司 | Rapid vacuum induction melting furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109365749A (en) * | 2018-12-06 | 2019-02-22 | 宁国市华成金研科技有限公司 | Precision-investment manufactures vacuum-thermoform production technology |
| CN110947909A (en) * | 2019-12-20 | 2020-04-03 | 苏州创实精密五金有限公司 | Manufacturing method of chromium bronze joint casting for generator |
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| CN113084089A (en) | 2021-07-09 |
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